ᴛʜᴇ ꜰɪʀꜱᴛ ʜᴀꜱʜɪʀᴀ || ᴀ ɢʀᴏᴜᴘ ʀᴏʟᴇᴘʟᴀʏ
Long ago before the Taisho era lived Yoriichi Tsugikuni. He discovered sun breathing and formed an organization known as the demon slayer corps. 10 of the best slayers were given the title hashira and they were to work to defeat Muzan's 12 Kizuki and him.